.header,
.main,
.footer {
  height: 100px;
  width: 500px;
  border: 1px solid #000;
  font-size: 18px;
  font-weight: bold;
}
.header {
  margin-bottom: 20px;
  color: palevioletred;
}
.main {
  margin-bottom: 20px;
  color: green;
}
.footer {
  color: blue;
}

.global-color {
  color: orange;
}
